The sources

Thinking, Fast and Slow

Kahneman, Daniel · Farrar, Straus and Giroux · 2011

Conceptual debt: System 1 / System 2.

Cited in

Kahneman, Daniel. Thinking, Fast and Slow. Farrar, Straus and Giroux, 2011. (Conceptual debt: System 1 / System 2.)